To reproduce:
1. Open project TargetMatchTest
2. Open scene Test
3. Enter play mode
4. Try moving the cube in the scene. The character should .MatchTarget to the cube. Sometimes it happens smoothly, other times the character just jumps into the position

Explanation: MatchTarget is called at every frame. Mecanim register one MatchTarget at a time. So once its set, it will keep the same target time, until target is reached or user has called InterruptMatchTarget.

Also, since this is a looped state, if MatchTarget is called after the targetTime, it will wait a whole cycle to reach it.

The jumps you see, they happen when you start moving the cube, making the matchTarget command active (since target not reached anymore) at a time that is a little under the targetTime.